VMAC – Vehicle Mounted Air Compressors
Toll Free: 1-800-738-8622 Local: 1-250-740-3200
Fax: 1-250-740-3201
27
Tool Description CFM x
Operating
(min/hr)
= CFH
1 1” impact 40 x 5 = 200
2 1/2” impact 20 x 5 = 100
3 Blow-off nozzle 2 x 5 = 10
4 Diaphragm pump 15 x 10 = 150
x =
x =
Total CFH (Cubic Feet per Hour) 460
Duty Cycle = Total CFH ÷ 3600 x 100%
= 460 ÷ 3600 x 100%
= 13%
Table 2 – Sample calculation
Use Table 3 to find the orifice size and expected CFM based on the
calculated duty cycle.
Duty Cycle Orifice Size Drill Size Consumption
5% 0.036 #64 3 CFM
10% 0.050 #55 6 CFM
15% 0.065 #52 9 CFM
20% 0.073 #49 12 CFM
30% 0.089 #43 18 CFM
40% 0.103 #37 24 CFM
50% 0.120 #31 30 CFM
60% 0.137 #29 36 CFM
70% 0.147 #26 42 CFM
80% 0.158 #21 48 CFM
90% 0.167 #19 54 CFM
100% 0.176 #16 60 CFM
Table 3 – Orifice sizes
To Next Page
Loading...
